I've looked at the drawing-artefact of the shadow and my best guess is
that it is a texture-coordinate mixup of the XRender-related EXA-
drawing. It looks like some texture-coordinate "index" is offset by one
in regards to the corresponding quad-vertex. Each shadow-texture is
turned clock-wise by 90 degrees.

What could be the cause for the window-border itself to be messed up I
currently do not know.

That's the best hint I can give right now to anyone being more familiar
with the codebase of intel's driver.

-- 
[hardy] Enabling "Normal" effects produces badly drawn window shadows.
https://bugs.launchpad.net/bugs/175774
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